US20050286374A1 - Optical disc device and recording medium - Google Patents

Optical disc device and recording medium Download PDF

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Publication number
US20050286374A1
US20050286374A1 US11/118,467 US11846705A US2005286374A1 US 20050286374 A1 US20050286374 A1 US 20050286374A1 US 11846705 A US11846705 A US 11846705A US 2005286374 A1 US2005286374 A1 US 2005286374A1
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United States
Prior art keywords
wavelength
laser
recording
laser power
characteristic
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US11/118,467
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English (en)
Inventor
Kenji Kakao
Morio Nakatani
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Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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Assigned to SANYO ELECTRIC CO., LTD. reassignment SANYO ELECTRIC CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NAKAO, KENJI, NAKATANI, MORIO
Publication of US20050286374A1 publication Critical patent/US20050286374A1/en
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • G11B7/1267—Power calibration

Definitions

  • the present invention relates to an optical disc device and a recording medium, and more particularly is suitable to adjust laser power.
  • trial writing is performed on a preset laser power adjustment area to set recording laser power to optimum power.
  • Such laser setting is generally performed by a ⁇ method. That is, trial writing is performed on the laser power adjustment area at predetermined power.
  • a ⁇ value is obtained from an asymmetry of a reproduction RF signal. The obtained ⁇ value is compared with a target ⁇ value required for the disc to set recording laser power.
  • FIG. 6 shows a ⁇ value calculation method.
  • the ⁇ value is obtained by calculation of (Itop+Ibtm)/(Itop ⁇ Ibtm) using amplitudes Itop and Ibtm of the a symmetry with respect to a reference potential Iref.
  • trial writing is performed at different laser powers to obtain a plurality of ⁇ values.
  • the ⁇ values are subjected to linear approximation to obtain laser power for providing the target ⁇ value.
  • the obtained laser power is set as the recording laser power.
  • laser power for trial writing is set to initial power recorded in a read-in area of the disc or initial power set in advance in a drive side. That is, first, trial writing is performed at initial power Pw 1 to obtain a ⁇ value. The obtained ⁇ value is compared with the target ⁇ value to set laser power Pw 2 for next trial writing. Then, trial writing is performed again at power Pw 2 to obtain a ⁇ value. When the number of trial writings is two, the two ⁇ values are subjected to linear approximation. Laser power for providing the target ⁇ value on an approximate line is set as the recording laser power.
  • the initial power Pw 1 is generally set with a state in which an ambient temperature of a semiconductor laser (such as a CAN package temperature) is about room temperature. Therefore, when the ambient temperature in the time of setting the recording power is significantly different from room temperature, a wavelength of emitted laser light is shifted relative to a wavelength of laser light in the time of initial setting.
  • a semiconductor laser for DVD-R wavelength: about 650 nm
  • a wavelength of a semiconductor laser produced by a maker is 650 nm and a wavelength of a semiconductor laser produced by another maker is 655 nm, so that there is a variation in wavelengths of semiconductor lasers. Therefore, even in the case of the same ambient temperature, a variation in outgoing wavelengths may occur, with the result that the outgoing wavelength in the time of setting the recording power may be shifted relative to the outgoing wavelength in the time of setting the initial power.
  • An object of the present invention is to provide an optical disc device capable of smoothly and adequately setting power even when an outgoing wavelength is shifted, and a recording medium used for the optical disc device.
  • the wavelength characteristic specifying means can be constructed to include a table for associating the laser wavelength with a correction value of the laser power.
  • the recording characteristic obtaining means obtains a correction value corresponding to the determined wavelength from the table.
  • the laser power adjusting means corrects a set value of the laser power based on the correction value obtained from the table.
  • the wavelength determining means can be constructed to include temperature obtaining means for obtaining an ambient temperature of a semiconductor laser element and to determine the wavelength of the outgoing laser light based on the temperature obtained by the temperature obtaining means and a change characteristic relationship between an ambient temperature and a laser wavelength.
  • the change characteristic relationship between the ambient temperature and the laser wavelength can be specified by a relational expression or a table.
  • the “ambient temperature” is a temperature near the laser element and indicates a temperature closely related to a temperature of the laser element itself, such as a temperature of a CAN package housing the laser element or a temperature of a fin for radiating heat from the laser element.
  • the laser power adjusting means can be constructed to adjust initial laser power used for trial writing in setting recording laser power based on the recording characteristic obtained by the recording characteristic obtaining means.
  • This structure is embodied in Embodiment 1, in which initial power for OPC (optical power control) is adjusted, of the following embodiments.
  • the laser power adjusting means can be also constructed to adjust previously set recording laser power based on the recording characteristic obtained by the recording characteristic obtaining means.
  • This structure is embodied in Embodiment 2, in which recording laser power set for the OPC is adjusted according to a subsequent change in temperature, of the following embodiments.
  • a recording medium in which wavelength characteristic information for specifying a relationship between a laser wavelength and a recording characteristic is recorded is treated.
  • the wavelength characteristic information can be recorded in the recording medium using a pit or a wobble.
  • the wavelength characteristic information can be recorded in the recording medium by writing data into a recording layer in advance.
  • the wavelength characteristic information can include a table for associating the laser wavelength with a correction value of laser power.
  • the wavelength characteristic information can include a table for associating the laser wavelength with light reflectance or a light absorption index in the recording layer. Any one of the correction value, the light reflectance and the light absorption index may be specified on a table, or both of the correction value and the light reflectance or both of the correction value and the absorption index may be specified on a table.
  • the laser power can be suitably corrected to adequate laser power according to the shifted wavelength.
  • the present invention is applied to laser power setting using a ⁇ method, trial writing is performed at adequate laser power to which initial power set in advance is corrected as appropriate. Therefore, the laser power can be smoothly set.
  • a wavelength shift caused during a period from stop to restart is estimated, so that previously set laser power can be corrected to adequate laser power to obtain laser power for next recording operation.
  • laser power can be smoothly set to adequate laser power without retrial writing.
  • FIG. 1 shows a structure of an optical disc according to Embodiment 1 of the present invention
  • FIG. 2 shows a block diagram of an optical disc device according to Embodiment 1 of the present invention
  • FIG. 3 shows a wavelength compensation table in Embodiment 1 of the present invention
  • FIG. 4 is a flowchart showing laser power setting processing in Embodiment 1 of the present invention.
  • FIG. 5 is a flow chart showing laser power resetting processing in Embodiment 2 of the present invention.
  • FIG. 6 is an explanatory graph showing a laser power setting method using a ⁇ method.
  • the present invention is applied to a high density DVD-R (HDDVD-R) recording and reproduction device using blue-violet laser light.
  • HDDVD-R high density DVD-R
  • FIG. 1 shows a structure of a disc (HDDVD-R) according to this embodiment.
  • a disc 100 is divided into an inner drive area, a read-in area, a data area, a read-out area, and an outer drive area in a radius direction.
  • the inner drive area and the outer drive area each are classified into various zones. Of the various zones, an inner disc test zone and an outer disc test zone are used to perform initial laser power setting (optimum write power control (OPC)).
  • OPC optimum write power control
  • spiral grooves are formed from the inner circumference to the outer circumference.
  • Data is recorded in the grooves.
  • the grooves are meandered (wobbled) in the radius direction. Address information is held by the wobble. That is, a phase modulation section which is called an address in pre-groove (ADIP) is inserted into a monotonic meandering section at regular intervals.
  • ADIP address in pre-groove
  • control data for the disc 100 are recorded in the ADIP of the read-in area by phase modulation.
  • the control data include identification information of a disc manufacturer by which the disc 100 is manufactured (manufacture ID).
  • a wavelength compensation table (see FIG. 3 ) described later is included in the ADIP information.
  • the wavelength compensation table is used for correcting initial power in the OPC based on a wavelength characteristic (relationship between a wavelength and reflectance) of the disc 100 .
  • FIG. 2 is a block diagram showing a structure of an optical disc device according to this embodiment.
  • the optical disc device includes an encoder 101 , a modulation circuit 102 , a laser drive circuit 103 , a laser power adjusting circuit 104 , an optical pickup 105 , a signal amplifying circuit 106 , a demodulation circuit 107 , a decoder 108 , a servo circuit 109 , an ADIP reproducing circuit 110 , a controller 111 , and a temperature sensor 112 .
  • the encoder 101 performs encoding processing such as addition of error correction codes on inputted recording data and outputs the processed recording data to the modulation circuit 102 .
  • the modulation circuit 102 performs predetermined modulation on inputted recording data, produces a recording signal, and outputs the recording signal to the laser drive circuit 103 .
  • the laser drive circuit 103 outputs to a semiconductor laser 105 a a drive signal corresponding to the recording signal from the modulation circuit 102 .
  • the laser drive circuit 103 outputs to the semiconductor laser 105 a a drive signal for emitting laser light having a predetermined intensity.
  • laser power adjusted by the laser power adjusting circuit 104 is set.
  • the laser power adjusting circuit 104 sets laser power for recording and reproduction based on a control value supplied from the controller 111 , suitably adjusts the set laser power based on an adjustment value supplied from the controller 111 , and supplies the adjusted laser power to the laser drive circuit 103 .
  • Laser power setting (OPC) is performed by, for example, a ⁇ method. That is, a ⁇ value ( ⁇ target) of the disc 100 is obtained from the controller 111 . Optimum recording laser power to the disc 100 is set based on the obtained ⁇ target. Note that the OPC will be described later in detail.
  • the optical pickup 105 includes the semiconductor laser 105 a and a photo detector 105 b and converges laser light on the groove to write and read data into and from the disc 100 .
  • the optical pickup 105 further includes an objective lens actuator for adjusting how the groove is irradiated with laser light and an optical system for guiding laser light emitted from the semiconductor laser 105 a to an objective lens and guiding reflection light on the disc 100 to the photo detector 105 b.
  • the signal amplifying circuit 106 performs amplification and calculation processing on a signal received from the photo detector 105 b to generate various signals and outputs the generated signals to corresponding circuits.
  • the demodulation circuit 107 demodulates a reproduction RF signal inputted from the signal amplifying circuit 106 to produce reproduction data and outputs the reproduction data to the decoder 108 .
  • the decoder 108 performs decode processing such as error correction on data inputted from the demodulation circuit 107 and outputs the processed data to a subsequent circuit.
  • the servo circuit 109 generates a focus servo signal and a tracking servo signal based on a focus error signal and a tracking error signal which are inputted from the signal amplifying circuit 106 and outputs the focus servo signal and the tracking servo signal to the objective lens actuator of the optical pickup 105 .
  • the servo circuit 109 generates a motor servo signal based on a wobble signal inputted from the signal amplifying circuit 106 and outputs the motor servo signal to a disc drive motor.
  • the ADIP reproducing circuit 110 reproduces address information and various pieces of control information based on the wobble signal inputted from the signal amplifying circuit 106 and outputs the address information and the various pieces of control information to the controller 111 .
  • the controller 111 includes an internal memory that stores various pieces of data and controls respective parts according to programs set in advance.
  • the controller 111 includes a ⁇ value table for associating manufacture IDs with target ⁇ values ( ⁇ targets).
  • the controller 111 compares a manufacture ID obtained from the read-in area (ADIP) of the disc 100 with the ⁇ value table, reads out a corresponding ⁇ target therefrom, and outputs the ⁇ target to the laser power adjusting circuit 104 .
  • the laser power adjusting circuit 104 sets recording laser power based on the outputted ⁇ target.
  • the temperature sensor 112 detects the ambient temperature T of the semiconductor laser 105 a and outputs a result obtained by detection to the controller 111 .
  • the temperature sensor 112 is composed of, for example, a thermistor and fixed to a CAN package housing the semiconductor laser 105 a . In this case, a detection value from the thermistor is inputted to the controller 111 .
  • the controller 111 obtains the ambient temperature T of the semiconductor laser 105 a based on the inputted detection value.
  • FIG. 3 shows the wavelength characteristic (relationship between a laser wavelength and disc reflectance) of the disc 100 and a wavelength compensation table.
  • a solid line on the wavelength characteristic graph shown in an upper region of FIG. 3 exhibits the general tendency of a wavelength characteristic of a so-called high-to-low disc whose reflectance is reduced by the formation of recording marks and a dot line thereon exhibits the general tendency of a wavelength characteristic of a so-called low-to-high disc whose reflectance is increased by the formation of recording marks.
  • the reflectance at a laser wavelength of 406 nm is 70%.
  • the reflectance increases.
  • the laser wavelength is smaller than 406 nm, the reflectance reduces.
  • the reflectance increases, a light absorption index is reduced according to the increased reflectance, so that the formation of the recording marks requires larger power.
  • the reflectance reduces, the light absorption index increases, so that the recording marks can be formed with smaller power.
  • the wavelength compensation table shown in a lower region of FIG. 3 is a table for associating each wavelength with a factor of necessary power intensity when the laser wavelength of 406 nm is set to a reference wavelength. That is, in the case of a wavelength of 408 nm, it is necessary to use laser power which is 1.02 times that at 406 nm. In the case of a wavelength of 404 nm, it is necessary to use laser power which is 0.96 time that at 406 nm. Note that FIG. 3 is an example and a compensation factor value is adjusted as appropriate according to the wavelength characteristic of the disc. Similarly, even in the case of the low-to-high disc, the compensation factor value is set as appropriate according to the wavelength characteristic of the disc.
  • the wavelength compensation table is included in the ADIP of the read-in area.
  • FIG. 4 shows a processing operation flow of the OPC.
  • the ADIP information of the read-in area is read and stored in the internal memory of the controller 111 (Step S 101 ).
  • the controller 111 obtain the current temperature T 1 from the temperature sensor 112 (Step S 103 ) and calculates a difference ⁇ T between the obtained temperature T 1 and the ambient temperature T 0 of the semiconductor laser 105 a in which the wavelength of the outgoing laser light is the reference wavelength ⁇ 0 (Step S 104 ).
  • a shift amount ⁇ from the reference wavelength ⁇ 0 is calculated from the obtained temperature difference ⁇ T (Step S 105 ) and the calculated shift amount ⁇ is added to the reference wavelength ⁇ 0 to obtain a current wavelength ⁇ 1 (Step S 106 ).
  • the shift amount ⁇ is calculated based on an expression of relationship between the ambient temperature of the semiconductor laser emitting the blue-violet laser light and a wavelength shift.
  • a wavelength shift For example, in the case of red laser light, there has been known, when the ambient temperature changes by 10° C., the wavelength is shifted by 2 nm.
  • the general tendency of the relationship between the ambient temperature of the semiconductor laser emitting the blue-violet laser light and the wavelength shift is determined based on a statistical or experimental method.
  • the wavelength shift amount ⁇ is calculated using the temperature difference ⁇ T by a relational expression indicating the general tendency.
  • the general tendency of the relationship between the ambient temperature and the wavelength shift may be set in a table and the wavelength shift amount ⁇ corresponding to the temperature difference ⁇ T may be obtained using the table.
  • the wavelength ⁇ 1 at the current temperature T 1 may be directly obtained from not the temperature difference ⁇ T but the temperature T 1 .
  • the relational expression and the table are adjusted to those indicating a relationship between the wavelength ⁇ 1 and the temperature T 1 .
  • the controller 111 reads the wavelength compensation table (lower region in FIG. 3 ) from the ADIP information stored in Step S 101 and obtains compensation factors ⁇ 0 and ⁇ 1 corresponding to the reference wavelength ⁇ 0 and the current wavelength ⁇ 1 from the read wavelength compensation table (Step S 107 ).
  • the initial laser power value Pw 0 is multiplied by a ratio of the compensation factors ⁇ 0 and ⁇ 1 ( ⁇ 1 / ⁇ 0 ).
  • Laser power Pw 1 obtained by the multiplication is set as initial power for OPC (Step S 108 ).
  • the controller 111 controls trial writing into the inner drive area or the outer drive area at the initial power Pw 2 .
  • An approximate line is calculated from ⁇ 1 and ⁇ 2 (Step S 112 ) and laser power Pp for providing the target ⁇ value ( ⁇ target) on the approximate line is obtained (Step S 113 ).
  • the controller 111 controls trial writing into the inner drive area or the outer drive area at the power Pp (Step S 114 ).
  • the area on which trial writing has been performed is reproduced and an error rate Er is obtained from the decoder 108 .
  • the error rate Er is compared with a threshold value Es.
  • the power Pp is set as the recording power (Step S 116 ).
  • the error rate Er is equal to or larger than the threshold value Es (Step S 115 : N)
  • processing returns to Step S 109 and subsequent processings are repeated.
  • the wavelength shift is detected from the temperature and the initial power for the OPC is adjusted according to a result obtained by the detection. Therefore, the OPC can be smoothly performed at adequate initial power.
  • the initial power Pw 0 is only compensated using the wavelength compensation table recorded in advance in a disk regardless of whether the disc is a high-to-low disc or a low-to-high disc, the initial power for OPC can be smoothly adjusted for the disc.
  • the initial power Pw 0 for OPC is corrected using the wavelength compensation table.
  • the wavelength compensation table can be also used to adjust the recording laser power Pp set during the OPC.
  • the recording laser power is set during the OPC and then not reset for a long time.
  • the recording laser power Pp is adjusted based on the current ambient temperature and the wavelength compensation table.
  • FIG. 5 shows a processing flow in such a case.
  • the controller 111 obtains the current temperature T 1 from the temperature sensor 112 (Step S 201 ) and calculates the difference ⁇ T between the obtained temperature T 1 and the ambient temperature T 0 (room temperature in this embodiment: 25° C.) of the semiconductor laser 105 a in which the wavelength of the outgoing laser light is the reference wavelength ⁇ 0 (Step S 202 ).
  • the shift amount ⁇ from the reference wavelength ⁇ 0 is calculated from the obtained temperature difference ⁇ T (Step S 203 ) and the calculated shift amount ⁇ is added to the reference wavelength ⁇ 0 to obtain the current wavelength ⁇ 1 (Step S 204 ).
  • the wavelength compensation table is read from the ADIP information stored in the internal memory and the compensation factor ⁇ 1 corresponding to the current wavelength ⁇ 1 is obtained from the read wavelength compensation table (Step S 205 ).
  • the wavelength ⁇ 2 provides a laser wavelength at the time of the recording laser power setting (OPC).
  • OPC recording laser power setting
  • the compensation factor ⁇ 2 corresponding to the wavelength ⁇ 2 is obtained from the wavelength compensation table (Step S 207 ).
  • Step S 208 the controller 111 multiplies the previously set recording laser power Pp by a ratio of the compensation factors ⁇ 1 and ⁇ 2 ( ⁇ 1 / ⁇ 2 ) (Step S 208 ) and sets laser power Pp obtained by the multiplication as recording laser power Pp for the recording (Step S 209 ).
  • the recording is continuously performed using the set recording laser power Pp (Step S 210 ).
  • the laser power is adjusted at each adjustment timing of recording laser power (R-OPC: running-OPC) such that, for example, a modulation factor of a reproduction RF signal follows a modulation factor in the laser power setting (OPC) (Step S 211 ).
  • the processings of Steps S 210 and S 211 are repeated until recording of data is completed (Step S 212 ).
  • Step S 212 Y
  • the recording operation is finished.
  • the initial power stored in the internal memory of the controller 111 is used as the initial power Pw 0 for the OPC.
  • Initial power included in the ADIP information of the disc may be used.
  • the compensation factors are described in the wavelength compensation table. Instead, wavelength characteristic values such as reflectances and light absorption indices may be described. In this case, it is necessary to suitably modify the correction flow of the initial power Pw 0 for the OPC (Embodiment 1) and the correction flow of the recording laser power Pp for the recording operation restarting (Embodiment 2) based on contents described in the wavelength compensation table.
  • the correction flow shown in Embodiment 1 is modified as follows.
  • Step S 107 reflectances r 0 and r 1 respectively corresponding to the reference wavelength ⁇ 0 and the current wavelength ⁇ 1 are obtained from the wavelength compensation table.
  • ⁇ denotes a correction factor for converting a reflectance ratio into a necessary power ratio.
  • the correction flow shown in Embodiment 2 is modified as follows.
  • Steps S 205 and S 207 reflectances r 1 and r 2 respectively corresponding to the current wavelength ⁇ 1 and the wavelength ⁇ 2 at the time of the OPC are obtained from the wavelength compensation table.
  • Step S 107 light absorption indices a 0 and a 1 respectively corresponding to the reference wavelength ⁇ 0 and the current wavelength ⁇ 1 are obtained from the wavelength compensation table.
  • the correction flow shown in Embodiment 2 is modified as follows.
  • Steps S 205 and S 207 light absorption indices a 1 and a 2 respectively corresponding to the current wavelength ⁇ 1 and the wavelength ⁇ 2 at the time of the OPC are obtained from the wavelength compensation table.
  • the recording laser power setting is performed using the ⁇ method.
  • Other setting methods may be used.
  • the present invention can be suitably applied to not only the HDDVD-R recording and reproduction device but also other optical disc devices.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)
US11/118,467 2004-06-23 2005-05-02 Optical disc device and recording medium Abandoned US20050286374A1 (en)

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JP2004185612A JP4145270B2 (ja) 2004-06-23 2004-06-23 光ディスク装置および記録媒体
JP2004-185612 2004-06-23

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JP (1) JP4145270B2 (zh)
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Cited By (3)

* Cited by examiner, † Cited by third party
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US20070183285A1 (en) * 2006-02-08 2007-08-09 Koichiro Nishimura Optical disk apparatus and recording parameters setting method
US20100260032A1 (en) * 2007-12-06 2010-10-14 Teruhiro Shiono Recording/reproduction device, recording/reproduction method, and information recording medium
CN116497443A (zh) * 2023-06-29 2023-07-28 江西兆驰半导体有限公司 一种外延片波长良率的调整方法及系统、外延片

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5188200B2 (ja) * 2008-02-25 2013-04-24 キヤノン株式会社 光学的記録再生装置
JP2011044209A (ja) * 2009-08-24 2011-03-03 Hitachi-Lg Data Storage Inc 光ディスク装置および光ディスク再生方法
KR102180842B1 (ko) * 2014-01-06 2020-11-19 주식회사 히타치엘지 데이터 스토리지 코리아 광 디스크 장치에서 파워 제어 방법

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US5715219A (en) * 1991-11-29 1998-02-03 Nippon Steel Corporation Displacement detecting device for optical head
US20010003641A1 (en) * 1999-12-07 2001-06-14 Haruo Kunitomo Optical recording medium and production method of the same
US20040037192A1 (en) * 2002-08-23 2004-02-26 Haruyuki Suzuki Recording condition compensation method, program, recording medium, and information recording apparatus
US6958967B2 (en) * 2000-11-17 2005-10-25 Matsushita Electric Industrial Co., Ltd. Holographic optical information recording/reproducing device

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Publication number Priority date Publication date Assignee Title
US5715219A (en) * 1991-11-29 1998-02-03 Nippon Steel Corporation Displacement detecting device for optical head
US20010003641A1 (en) * 1999-12-07 2001-06-14 Haruo Kunitomo Optical recording medium and production method of the same
US6958967B2 (en) * 2000-11-17 2005-10-25 Matsushita Electric Industrial Co., Ltd. Holographic optical information recording/reproducing device
US20040037192A1 (en) * 2002-08-23 2004-02-26 Haruyuki Suzuki Recording condition compensation method, program, recording medium, and information recording apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070183285A1 (en) * 2006-02-08 2007-08-09 Koichiro Nishimura Optical disk apparatus and recording parameters setting method
US20100260032A1 (en) * 2007-12-06 2010-10-14 Teruhiro Shiono Recording/reproduction device, recording/reproduction method, and information recording medium
US8264940B2 (en) * 2007-12-06 2012-09-11 Panasonic Corporation Recording/reproduction device, recording/reproduction method, and information recording medium
CN116497443A (zh) * 2023-06-29 2023-07-28 江西兆驰半导体有限公司 一种外延片波长良率的调整方法及系统、外延片

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CN1722243A (zh) 2006-01-18
JP2006012254A (ja) 2006-01-12
TW200603139A (en) 2006-01-16

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